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Answer:

  • Tritium is the isotope of hydrogen which is radioactive.

  • Deuterium is the isotope of hydrogen which contains equal number of protons and neutrons.

#1

  • Tritium

Chemical symbol is

[tex]\\ \rm\rightarrowtail _1^3H[/tex]

  • As per instability in nucleus it is unstable so it decays beta particles.

#2

Its Deuterium

  • D_2 O or heavy water is used in nuclear reactors

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